Method and Apparatus for Transmitting Uplink Control Channel in a Mobile Communication System

1. A method for transmitting an uplink control channel at a terminal in a Single Carrier Frequency Division Multiple Access (SC-FDMA)-based mobile communication system, the method comprising: receiving a control channel index allocated from a base station; transmitting control information at every symbol using a first subband and a first Zadoff-Chue sequence offset resource, the first subband and the first Zadoff-Chue sequence offset resource being mapped to the control channel index according to a first grouping rule; and transmitting control information using a second subband and a second Zadoff-Chue sequence offset resource, the second subband and the second Zadoff-Chue sequence offset resource being mapped to the control channel index according to a second grouping rule, beginning from a symbol after a slot boundary.

2. The method of claim 1 , wherein the first grouping rule permutes control channel indexes allocated to terminals according to a predetermined criterion, classifies the permuted control channel indexes into groups, a number of the groups being equal to a number of subbands available in a current slot, and maps the Zadoff-Chue sequence offset to the permuted control channel index in each of the groups.

3. The method of claim 2 , wherein the second grouping rule re-permutes the control channel indexes in a different order from an order in which the control channel indexes are permuted according to the first grouping rule.

4. A method for receiving an uplink control channel at a base station in a Single Carrier Frequency Division Multiple Access (SC-FDMA)-based mobile communication system, the method comprising: allocating control channel indexes to one or more terminals; receiving control information at every symbol using a first subband and a first Zadoff-Chue sequence offset resource, the first subband and the first Zadoff-Chue sequence offset resource being mapped to the control channel index according to a first mapping rule; and receiving control information transmitted using a second subband and a second Zadoff-Chue sequence offset resource, the second subband and the second Zadoff-Chue sequence offset resource being mapped to the control channel index according to a second mapping rule, beginning from a symbol after a slot boundary.

5. The method of claim 4 , wherein the first grouping rule permutes control channel indexes allocated to the terminals according to a predetermined criterion, classifies the permuted control channel indexes into groups, a number of the groups being equal to a number of subbands available in a current slot, and maps the Zadoff-Chue sequence offset to the permuted control channel index in each of the groups.

6. The method of claim 5 , wherein the second grouping rule re-permutes the control channel indexes in a different order from an order in which the control channel indexes are permuted according to the first grouping rule.

7. An apparatus for transmitting an uplink control channel at a terminal in a Single Carrier Frequency Division Multiple Access (SC-FDMA)-based mobile communication system, the apparatus comprising: a transmission unit; a reception unit for receiving a control channel index allocated from a base station; and a controller for controlling the transmission unit so that control information is transmitted at every symbol using a first subband and a first Zadoff-Chue sequence offset resource, the first subband and the first Zadoff-Chue sequence offset resource being mapped to the control channel index according to a first grouping rule, and control information is transmitted using a second subband and a second Zadoff-Chue sequence offset resource, the second subband and the second Zadoff-Chue sequence offset resource being mapped to the control channel index according to a second grouping rule, beginning from a symbol after a slot boundary.

8. The apparatus of claim 7 , wherein the first grouping rule permutes control channel indexes allocated to terminals according to a predetermined criterion, classifies the permuted control channel indexes into groups, a number of the groups being equal to a number of subbands available in a current slot, and maps the Zadoff-Chue sequence offset to the permuted control channel index in each of the groups.

9. The apparatus of claim 8 , wherein the second grouping rule re-permutes the control channel indexes in a different order from an order in which the control channel indexes are permuted according to the first grouping rule.

10. An apparatus for receiving an uplink control channel at a base station in a Single Carrier Frequency Division Multiple Access (SC-FDMA)-based mobile communication system, the apparatus comprising: a controller for allocating control channel indexes to one or more terminals; a reception unit for receiving control information at every symbol transmitted using a first subband and a first Zadoff-Chue sequence offset resource, the first subband and the first Zadoff-Chue sequence offset resource being mapped to the control channel index according to a first grouping rule, and receiving control information transmitted using a second subband and a second Zadoff-Chue sequence offset resource, the second subband and the second Zadoff-Chue sequence offset resource being mapped to the control channel index according to a second grouping rule, beginning from a symbol after a slot boundary.

11. The apparatus of claim 10 , wherein the first grouping rule permutes control channel indexes allocated to the terminals according to a predetermined criterion, classifies the permuted control channel indexes into groups, a number of the groups being equal to a number of subbands available in a current slot, and maps the Zadoff-Chue sequence offset to the permuted control channel index in each of the groups.

12. The apparatus of claim 11 , wherein the second grouping rule re-permutes the control channel indexes in a different order from an order in which the control channel indexes are permuted according to the first grouping rule.